w9425g6dh Winbond Electronics Corp America, w9425g6dh Datasheet - Page 29

• Manufacturer Part Number: w9425g6dh
• Description: 4m X 4 Banks X 16 Bits Ddr Sdram
• Manufacturer: Winbond Electronics Corp America

(11) IF the result of nominal calculation with regard to t
(12) V
(13) V
(14) V
(15) Refer to the figure below.
(16) t
(17) A maximum of eight AUTO REFRESH commands can be posted to any given DDR SDRAM device.
(18) t
the nearest decimal place.
(i.e., T
AC
DAL
X
ID
ISO
0 V Differential
is the differential clock cross point voltage where input timing measurement is referenced.
and t
is magnitude of the difference between CLK input level and CLK input level.
= (t
means {V
DQSS
WR
DQSCK
V
/t
ID(AC)
= 0.75 × t
V
CLK
CLK
CK
V
V
ISO
SS
SS
) + (t
ICK
depend on the clock jitter. These timing are measured at stable clock.
(CLK)+V
V
ICK
RP
V
CK
/t
X
CK
, t
)
CK
ICK
= 7.5 nS, 0.75 × 7.5 nS = 5.625 nS is rounded up to 5.6 nS.)
( CLK )}/2.
V
ISO(min)
V
V
ICK
X
CK
contains more than one decimal place, the result is rounded up to
V
- 29 -
X
V
ISO(max)
V
ICK
Publication Release Date:Feb. 12, 2008
V
X
V
ICK
W9425G6DH
V
X
V
ID(AC)
Revision A8